There is a healthy radar discussion going on in the Audio/Electronics forum, please read, lots of info, including my picks.
As to location, off the dash, my favorite is up between the mirror and the roof.....
You can fab up a small 'U' type mount that fits under (on top of!) the reading lamp mount up there,with the very important benefit of being able to tap into some power from the lights!.
The real benefit though, comes when you crest a hill - the detector sees the beam long before you do, while you still have a very small radar 'profile' with just your roof visible over the hill.(Much the same trick as those tank-busting helicopters use, only the radar showing above the ridge of the hill.) Absolutely the best location, even if an officer stops me, he is unlikely to look up above the mirror. (Not that there is anything wrong with that!)
Radars are legal here, I just don't like to antagonize police further than necessary!
ANYHOOO..check out the Valentine fan club in the other forum!
“You give a man a fish - you feed him for one day,
You whack him - you don't got any more of this 'gimme a fish' bullshit!" - Tony Soprano